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RustHost

"Rust is a general-purpose, multi-paradigm, compiled programming language sponsored by Mozilla Research. It is designed to be a "safe, concurrent, practical language", supporting functional and imperative-procedural paradigms." (source: Wikipedia)

Summary

• We have a Rust Accessor Host can execute the TestComposite.js composite accessor, see accessors/web/hosts/duktape/rusteduk/examples/rusteduk.js
  • Note that the Rust Accessor Host uses Duktape and Duktape is written in C, so we are calling unsafe code.
    • Future work would be to use a JavaScript interpreter implemented in Rust, see JavaScript Rust dead ends for starting points
  • To be useful, we would need to create modules like to support WebSockets or UDP.
  • The rusteduk binary is 4.4Mb in size and strips down to 1.2Mb. See Why do Rust programs use more memory than C?
    • A duktape binary that does not use Rust (accessors/web/hosts/duktape/duktape/duktape) is 364k, which strips down to 334k
    • A very minimal duktape binary (accessors/web/hosts/duktape/eduk/eduk) strips down to 320k
• The TockOS kernel is written in Rust, but TockOS userland programs are written in C.
  • Since the Rust Host uses Duktape and Duktape is in C, then we can write our TockOS userland Accessor Host in C and we don't really need the Rust Host (See TockOS).
    • However, if we had a 100% Rust implementation of Duktape, then perhaps Rusteduk could be part of the TockOS kernel.

How to run the Rust Accessor Host

1. It is a bit easier to use rustup to manage the different versions of rust than to install just one version. So, see https://www.rustup.rs/ for how to install rustup
2. The rust accessor host worked with rust 1.12.1. Probably running
   rustup default stable

   [$[Get Code]]
   will install a version that works.
3. Download the accessors svn repo. See the instructions, or do
   svn co https://repo.eecs.berkeley.edu/svn-anon/projects/terraswarm/accessors/trunk/accessors

   [$[Get Code]]
4. Build and run:
   cd accessors/web/hosts/duktape/rusteduk
   make test

   [$[Get Code]]
   The makefile merely builds the examples/rusteduk.js example with
   cargo build --example rusteduk

   [$[Get Code]]
   and the runs it with
   (cd ../..; duktape/rusteduk/target/debug/examples/rusteduk duktape/test/testComposite.js)

   [$[Get Code]]
   For example:
   [cxh@terra rusteduk]$ make test
   (cd ../..; duktape/rusteduk/target/debug/examples/rusteduk duktape/test/testComposite.js)
   Read in duktape/duktapeHost.js.
   module_loader: Done! Successfully found common/commonHost.js.
   module_loader: Done! Successfully found common/modules/util.js.
   module_loader: Done! Successfully found common/modules/events.js.
   duktapeHost.js done
   duktape/rusteduk/target/debug/examples/rusteduk: duktapeHost.js: result was Undefined
   Read in duktape/duktape/examples/eventloop/ecma_eventloop.js.
   duktape/rusteduk/target/debug/examples/rusteduk: duktapeHost.js: result was Object({"clearInterval": Object({}), "setInterval": Object({}), "setTimeout": Object({})})
   Read in duktape/test/testComposite.js.
   duktape/test/testComposite.js: OK: output was 50, which is equal to 50.
   duktape/rusteduk/target/debug/examples/rusteduk: result was Undefined
   [cxh@terra rusteduk]$

   [$[Get Code]]

See Also

• Rust - notes about accessors and Rust
• http://www.tockos.org/ "Tock is a safe, multitasking operating system for low-power, low-memory microcontrollers." ... written in Rust
• "Ownership is Theft: Experiences Building an Embedded OS in Rust"
  Amit Levy, Michael P Andersen, Bradford Campbell, David Culler, Prabal Dutta, Branden Ghena, Philip Levis, and Pat Pannuto
  In 8th Workshop on Programming Languages and Operating Systems (PLOS'15)
  Monterey, CA, USA, October 4, 2015
• TockOS - notes about TockOS